KR960013795B1 - Beam splitter - Google Patents

Beam splitter Download PDF

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Publication number
KR960013795B1
KR960013795B1 KR1019930020240A KR930020240A KR960013795B1 KR 960013795 B1 KR960013795 B1 KR 960013795B1 KR 1019930020240 A KR1019930020240 A KR 1019930020240A KR 930020240 A KR930020240 A KR 930020240A KR 960013795 B1 KR960013795 B1 KR 960013795B1
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South Korea
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refractive index
material layer
index material
medium
substrate
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KR1019930020240A
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Korean (ko)
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KR950009285A (en
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최양오
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대우전자 주식회사
배순훈
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering

Abstract

The non-polarizing beam splitter comprises a number of stacks formed with a high refractive index epilayer(15), a medium refractive index epilayer(14), a low refractive index epilayer(13) and a medium refractive index epilayer(12) in sequence between a substrate(10) and a protective layer(11). The method enables to design easily withou using an optimization program.

Description

비편광 광분리기Unpolarized Optical Separator

도면1는 종래 비편광 광분리기의 일실시예를 나타낸 단면도.1 is a cross-sectional view showing an embodiment of a conventional non-polarization optical splitter.

도면2는 종래 비편광 광분리기의 다른 실시예를 나타낸 단면도.2 is a cross-sectional view showing another embodiment of the conventional non-polarization optical splitter.

도면3은 종래 기술에 의한 편광을 나타낸 그래프.Figure 3 is a graph showing the polarization according to the prior art.

도면4는 본 발명에 따른 비편광 광분리기의 바람직한 실시예를 나타낸 단면도.Figure 4 is a cross-sectional view showing a preferred embodiment of the non-polarization optical splitter according to the present invention.

*도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10 : 기판 11 : 보호층10 substrate 11 protective layer

12,14 : 중굴절률 물질층 13 : 저굴절률 물질층12,14: medium refractive index material layer 13 low refractive index material layer

15 : 고굴절률 물질층15: high refractive index material layer

본 발명은 비편광 광분리기에 관한 것으로, 특히, 입사광을 일정한 비율로 분리하기에 적합한 비편광 광분리기에 관한 것이다.FIELD OF THE INVENTION The present invention relates to non-polarized light splitters, and more particularly to non-polarized light splitters suitable for separating incident light at a constant rate.

잘 알려진 바와같이, 비편광 광분리기는 1960년대 이후 컴퓨터(computer)의 발달과 설계 기술의 진보로 많은 발전이 있었다. 이것의 대표적인 기술로는 옵티머제이션 프로그램(optimization program)을 이용하여 물질의 굴절률이나 물질의 두께를 선정하여 원하는 특성을 얻는 방법이 있다.As is well known, unpolarized optical splitters have made great progress in the development of computers and advances in design technology since the 1960s. Its typical technique is a method of obtaining a desired characteristic by selecting the refractive index of the material or the thickness of the material by using an optimization program (optimization program).

도면1도는 종래 비편광 광분리기의 일실시예를 나타낸 단면도로, 기판(유리)(1)위에 각각의 굴절률을 갖는 물질층이 다수 형성되어 이루어진다.1 is a cross-sectional view showing an embodiment of a conventional non-polarization optical splitter, in which a plurality of material layers having respective refractive indices are formed on a substrate (glass) 1.

단, 이후에 인용될 도면3의 특성을 갖는 기판 파장/4만큼의 광학적 두께를 갖는 비편광 광분리기는 입사면에서부터 유리, 고굴절률 물질층, 중굴절률 물질층, 저굴절률 물질층, 중굴절률 물질층, 고굴절률 물질층, 중굴절률 물질층, 저굴절률 물질층, 중굴절률 물질층, 고굴절률 물질층, 중굴절률 물질층, 저굴절률 물질층, 중굴절률 물질층, 고굴절률 물질층, 저굴절률 물질층, 중굴절률 물질층 그리고 유리가 차례로 형성되어 이루어진다.However, a non-polarization optical splitter having an optical thickness of the substrate wavelength / 4 having the characteristics of FIG. 3 to be cited later may include glass, a high refractive index material layer, a medium refractive index material layer, a low refractive index material layer, and a medium refractive index material from an incident surface. Layer, high refractive index material layer, medium refractive index material layer, low refractive index material layer, medium refractive index material layer, high refractive index material layer, medium refractive index material layer, low refractive index material layer, medium refractive index material layer, high refractive index material layer, low refractive index material layer A layer, a medium refractive index material layer, and glass are formed in this order.

이때, 유리의 굴절률은 1.52이고, 저굴절률 물질층의 굴절률은 1.38, 중굴절률 물질층의 굴절률은 1.60, 고굴절률 물질층의 굴절률은 2.35, 기준 파장은 6328Å(angstrom)이며, 우측면에서 입사되는 광의 입사각은 45도이다.At this time, the refractive index of the glass is 1.52, the refractive index of the low refractive index material layer is 1.38, the refractive index of the medium refractive index material layer is 1.60, the refractive index of the high refractive index material layer is 2.35, the reference wavelength is 6328 Å (angstrom), The incident angle is 45 degrees.

그러나, 상기한 바와같은 구조를 종래의 기술에 있어서는 다음과 같은 결점이 있다.However, the above structure has the following drawbacks in the prior art.

첫째, 각각의 굴절률을 갖는 다수의 박막 물질층의 두께를 변화시킬 경우, 옵티머제이션 프로그램을 이용해야 하므로써 그 박막 물질층을 옵티머제이션 프로그램에 의한 일정한 두께로 코팅하기가 어렵다.First, when the thickness of a plurality of thin film material layers having respective refractive indices is changed, it is difficult to coat the thin film material layer with a constant thickness by the optimization program because the optimization program should be used.

둘째, 넓은 파장 영역에서 광의 비편광 현상을 나타내기가 어렵다.Second, it is difficult to exhibit non-polarization of light in a wide wavelength range.

섯째, 도면3에 도시된 바와같이 비편광 영역에서 P파의 편광과 S파의 편광 차이가 크다.Fifth, as shown in FIG. 3, the polarization difference between the P wave and the S wave is large in the non-polarization region.

따라서, 본 발명은 상기한 바와같은 종래 기술은 결점을 해결하기 위하여 안출한 것으로, 광이 사각으로 입사하는 경우에 생기는 편광 현상을 제거하여 입사하는 광이 원래의 성질을 갖도록 하면서 입사광을 일정한 비율로 분리할 수 있는 비편광 광분리기를 제공하는데 그 목적이 있다.Accordingly, the present invention has been made to solve the drawbacks as described above, to eliminate the polarization phenomenon that occurs when the light is incident in a square, so that the incident light has the original properties while keeping the incident light at a constant ratio Its purpose is to provide a non-polarized light splitter that can be separated.

상기 목적을 달성하기 위하여 본 발명은, 기판과 보호층 사이에 다수의 스택이 형성되고, 상기 각 스택을 고굴절률 물질층, 중굴절률 물질층, 저굴절률 물질층 및 중굴절률 물질층이 차례로 형성된 것을 특징으로 하는 비편광 광분리기를 제공한다.In order to achieve the above object, in the present invention, a plurality of stacks are formed between the substrate and the protective layer, and each of the stacks includes a high refractive index material layer, a medium refractive index material layer, a low refractive index material layer, and a medium refractive index material layer. A non-polarization optical splitter is provided.

이하, 본 발명의 바람직한 실시예에 대하여 첨부된 도면을 참조하여 상세히 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도면4를 참조하면, 본 발명에 따른 비편광 광분리기의 바람직한 실시예를 나타낸 단면도로, 기판(유리)(10)과 보호층(유리)(11) 사이에 고굴절률 물질층(15), 중굴절률 물질층(14), 저굴절률 물질층(13) 그리고 중굴절률 물질층(12)을 기본 스택으로 할 경우, 다수의 스택으로 형성되어 이루어진다.Referring to Figure 4, a cross-sectional view showing a preferred embodiment of the non-polarization optical splitter according to the present invention, a high refractive index material layer 15 of the substrate (glass) 10 and the protective layer (glass) 11 When the refractive index material layer 14, the low refractive index material layer 13, and the medium refractive index material layer 12 are used as the basic stacks, they are formed of a plurality of stacks.

이와 같이 이루어진 본 발명은 보면, 먼저, 굴절률 표(도면중에 도시되지 않음)로부터 굴절률이 차가 큰 고굴절률 물질 및 저굴절률 물질을 찾는다. 즉, 이펙티브 인덱스(effective index)=1을 만족하는 물질을 선택한다.In the present invention thus made, first, a high refractive index material and a low refractive index material having a large difference in refractive index are found from the refractive index table (not shown in the figure). In other words, a substance satisfying the effective index = 1 is selected.

다음에, 디자인 방법에 의하여 적당한 중간 굴절률을 갖는 중굴절률 물질을 선택한다.Next, a medium refractive index material having a suitable intermediate refractive index is selected by the design method.

이어서, 기판(10)과 보호층(11) 사이에 고굴절률 물질층(15), 중굴절률 물질층(14), 저굴절률 물질층(13) 그리고 중굴절률 물질층(12)을 기본 스택으로 하는 n개의 스택을 구성한다.Subsequently, a high refractive index material layer 15, a medium refractive index material layer 14, a low refractive index material layer 13, and a medium refractive index material layer 12 are formed as a basic stack between the substrate 10 and the protective layer 11. Make up n stacks.

이때, n은 임의의 정수이며, 유리의 굴절률은 1.52이고, 저굴절률 물질층의 굴절률은 1.38, 중굴절률 물질층의 굴절률은 1.60, 고굴절률 물질층의 굴절률은 2.35, 기준 파장은 6328Å이며, 우측면에서 입사되는 광의 입사각은 45도이고, 각각의 고, 중, 저굴절률 물질층의 광학상 두께(optical thickness)는 기준 파장/4이 되도록 한다.In this case, n is an arbitrary integer, the refractive index of the glass is 1.52, the refractive index of the low refractive index material layer is 1.38, the refractive index of the medium refractive index material layer is 1.60, the refractive index of the high refractive index material layer is 2.35, the reference wavelength is 6328Å, the right side The incident angle of the light incident at is 45 degrees, and the optical thickness of each of the high, medium and low refractive index material layers is set to the reference wavelength / 4.

그리고, 기본 스택의 수를 조절하여 원하는 반사율 또는 투과율을 구한다. 다음에, 마지막으로 형성되는 기본 스택의 저굴절률 물질층, 고굴절률 물질층 그리고 중굴절률 물질층을 다른 물질로 적당히 선택하여 원하는 비편광 광분리기를 완성한다.Then, the number of base stacks is adjusted to obtain a desired reflectance or transmittance. Next, the low refractive index material layer, the high refractive index material layer, and the medium refractive index material layer of the finally formed base stack are appropriately selected as other materials to complete the desired non-polarization optical splitter.

이상에서 설명한 바와 같이 본 발명은 모든 물질층의 광학상 두께를 기준 파장/4으로 형성하므로 옵티머제이션 프로그램을 사용하지 않고도 쉽게 설계할 수 있으며 비편광 현상의 파장 영역이 넓어지는 효과가 있다.As described above, the present invention forms the optical image thickness of all the material layers at the reference wavelength / 4, so that the design can be easily performed without using an optimization program, and the wavelength region of the non-polarization phenomenon is widened.

Claims (4)

기판(10)과 보호층(11) 사이에 다수의 스택이 형성되고, 상기 각 스택은 고굴절률 물질층, 중굴절률 물질층, 저굴절률 물질층 및 중굴절률 물질층이 차례로 형성된 것을 특징으로 하는 비편광 광분리기.A plurality of stacks are formed between the substrate 10 and the protective layer 11, wherein each stack has a high refractive index material layer, a medium refractive index material layer, a low refractive index material layer, and a medium refractive index material layer in turn. Polarized light splitter. 제1항에 있어서, 상기 기판(10) 또는 보호층(11)은 유리로 된 비편광 광분리기.The unpolarized light separator of claim 1, wherein the substrate (10) or protective layer (11) is made of glass. 제1항에 있어서, 상기 모든 물질층중 적어도 하나의 물질층 두께가 기준 파장/4인 것을 특징으로 하는 비편광 광분리기.The non-polarization optical splitter according to claim 1, wherein the thickness of at least one material layer of all the material layers is reference wavelength / 4. 제3항에 있어서, 상기 고굴절률 물질층의 굴절률은, 2.35, 중굴절률 물질층의 굴절률은 1.60, 저굴절률 물질층의 굴절률은 1.38인 것을 특징으로 하는 비편광 광분리기.The non-polarization optical splitter according to claim 3, wherein the refractive index of the high refractive index material layer is 2.35, the refractive index of the medium refractive index material layer is 1.60, and the refractive index of the low refractive index material layer is 1.38.
KR1019930020240A 1993-09-28 1993-09-28 Beam splitter KR960013795B1 (en)

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KR960013795B1 true KR960013795B1 (en) 1996-10-10

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